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P=⅓a²+⅓*2ax I*3
3P=a²+2ax I:x
(3P):x=a²+2ax I:3P
x=(a²+2ax):3P
p.s. daj najlepszą:) pozdrawiam:)
3P=a² + 2ax
3P-a² =2ax |2a
x=3P-a² /2a